Refined audio faking procedure.

lib/modifiedAudioAPI.js

@@ -18,6 +18,7 @@
 	
 	var randomSupply = null;
 	
+	const getAudioFakeRate = function(){
 		const audioFakeRate = {
 			"1": function(array){return 1;},
 			"10": function(array){return 10;},
@@ -26,7 +27,7 @@
 			"0.1%": function(array){return array.length / 1000;},
 			"1%": function(array){return array.length / 100;},
 		};
-	function getAudioFakeRate(array, prefs){
+		return function getAudioFakeRate(array, prefs){
 			var func = audioFakeRate[prefs("audioFakeRate")];
 			if (typeof func === "function"){
 				return func(array);
@@ -34,41 +35,65 @@
 			else {
 				return 10;
 			}
-	}
-	const audioNoiseLevel = {
-		"minimal": 0.0000001,
-		"low": 0.00001,
-		"medium": 0.001,
-		"high": 0.01,
-		"maximal": 0.1
 		};
-	function getAudioNoiseLevel(prefs){
-		return audioNoiseLevel[prefs("audioNoiseLevel")] || 0.0000001;
+	}();
+	const getAudioNoiseLevel = function(){
+		const audioNoiseLevel = {
+			"minimal": 0.0001,
+			"low": 0.0005,
+			"medium": 0.001,
+			"high": 0.005,
+			"maximal": 0.01
+		};
+		return function getAudioNoiseLevel(prefs){
+			return audioNoiseLevel[prefs("audioNoiseLevel")] || 0.0001;
+		};
+	}();
+	function forEachFixedIndex(prefs, callback){
+		if (prefs("audioUseFixedIndices")){
+			prefs("audioFixedIndices")
+				.split(",")
+				.map(function(str){
+					return parseInt(str, 10);
+				}).filter(function(num){
+					return !isNaN(num);
+				}).filter(function(num, i, array){
+					return array.indexOf(num) === i;
+				}).forEach(callback);
+		}
+	}
+	
+	function forEachIndex(array, prefs, callback){
+		var l = array.length;
+		var rate = getAudioFakeRate(array, prefs);
+		var indexRng = randomSupply.getIndexRng(rate, l, window);
+		var start = 0;
+		forEachFixedIndex(prefs, function(index){
+			callback(index, start);
+			start += 1;
+		});
+		for (var i = start; i < rate; i += 1){
+			callback(indexRng(i), i);
+		}
 	}
 	
 	function fakeFloat32Array(array, window, prefs){
 		if (prefs("protectAudio")){
-			var l = array.length;
 			var rate = getAudioFakeRate(array, prefs);
 			var noiseLevel = getAudioNoiseLevel(prefs);
-			var indexRng = randomSupply.getIndexRng(rate, l, window);
 			var rng = randomSupply.getRng(rate, window);
-			for (var i = 0; i < rate; i += 1){
-				var index = indexRng(i);
-				array[index] += (rng(i) / 0xffffffff - 0.5) * noiseLevel;
-			}
+			forEachIndex(array, prefs, function(index, i){
+				array[index] *= 1 + (rng(i) / 0xffffffff - 0.5) * noiseLevel;
+			});
 		}
 	}
 	function fakeUint8Array(array, window, prefs){
 		if (prefs("protectAudio")){
-			var l = array.length;
 			var rate = getAudioFakeRate(array, prefs);
-			var indexRng = randomSupply.getIndexRng(rate, l, window);
 			var rng = randomSupply.getValueRng(rate, window);
-			for (var i = 0; i < rate; i += 1){
-				var index = indexRng(i);
+			forEachIndex(prefs, function(index, i){
 				array[index] = rng(array[index], i);
-			}
+			});
 		}
 	}
 	

lib/settingDefinitions.js

@@ -174,7 +174,7 @@
 		},
 		{
 			name: "audioNoiseLevel",
-			defaultValue: "low",
+			defaultValue: "minimal",
 			options: ["minimal", "low", "medium", "high", "maximal"]
 		},
 		{